In recent years, there is occurrence continuously in the ND La Sota vaccine immunity and high antibody chicken, some scholars reported its reason with not only immunity method, path, vaccine etc.

  • 据报道,原因不仅与免疫方法、途径、疫苗等有关,更重要的是与新城疫的毒株的变异,不同的基因型的出现有关。

  • 互联网摘选 2025-02-25 10:08:26

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